It may, as I have before stated, have been probably the taking of Winchester by the Saxon Cerdic in 515 which caused Arthur to concentrate his forces in the Western Peninsula. Cameliard was now his, in right of his wife. He determined therefore to fortify his kingdom, and at the three extreme points to place strong castles, which he strengthened by every available means. These points were Caerleon on Usk, which guarded the Sabrina or estuary of the Severn, and St. Michael’s Mount at the extreme south-west; but the post of danger and therefore of honour was held by Camelot. He pitched with an experienced eye upon this great Belgic fortress, situated in one of the most fertile and picturesque parts of South Somerset, as the place where the great stand must be made. The shape of the mound is irregular, neither quite round nor square; part of it was hewed from the solid rock, its circumference is about a mile. Four deep ditches in concentric rings with as many ramparts of earth and stones form the primary defences: these are further strengthened by a series of zig-zag terraces on inclined planes, so constructed that the besieged, though he retreated from his assailants, could still make a desperate resistance. On the top of this fortified mount is a moated mount or Prætorium, enclosing a space of at least twenty acres; and here Merlin raised the enchanted Palace of Camelot. The spot must have been well-nigh impregnable in days when artillery was unknown. Here, then, was Arthur’s great rallying point; hither the persecuted fled for protection, the wronged for redress, the patriotic to assist in the defence of their county. Every possibility of defence and adornment was lavished here; and here were held, specially at Whitsuntide, chapters of the order of the Knights of the Round Table. Here, in intervals of peace, were held the mimic games of warfare, and from here, after a time of repose, they issued forth again and again against the heathen hordes. Within the Greater Triangle was a smaller and more sacred one; its three points were the Tor Hill at Glastonbury, the Mons Acutus or Montacute, and Camelot itself; lines drawn from point to point made an equilateral triangle, each side being twelve miles in length. This twice, trebly guarded territory was defended by saintly shield from invasion, and from any noxious or venomous creature.